I've never had any trouble with my '12 starting in the cold weather. The lowest it has seen is in the single digits but I've read on this forum of other guys starting in the negatives with no issues. Might need to have yours checked out.
When I do plug it in, I have it set on a timer for approx. 3 hrs before I will start and us it.

Mine has been plugged in since late Sunday night. It is in a garage and has anti-gel from Ford in it AND a full tank of fuel. I have been as low as -40 the last couple of nights. But have been off work since then and have not started it up. I think I will tomorrow or tonight maybe?

I usually dont plug mine in but i think im going to start. Started mine for the first time in 2 1/2 days unplugged and boy she was cranky. It was like 1 degree with -22 windchill when i started it. She started fine but after it fired it ran kinda rough and smoked like ive never seen before.

I normally plug in at -20c (-5f) or below but have had started without plugging in temps between -25 and -30 temperature without factoring windchill. Never had any issues with fuel gelling and we see temps in the -40 to -45 range for short periods pretty much every winter.

Gelling is definitely the issue! Keep over 1/2 tank fuel at all times in the cold winter months. Use diesel kleene in the white bottle with the cetane boost. Don't buy the little bottles, get the gallon bottle which is way more bang for your buck. My 6.4 doesn't even have a block heater (which is bull. IDK when Ford/international stopped that deal because I thought all diesels came standard with one) and it starts just fine, even this morning with -40 windchills

Fuel gel has nothing to do with plugging block heater in. I plug my 6.4 in almost all winter and ended up with gelled fuel today ......even though I use diesel kleen artic every tank! It was well below zero degrees here in missouri last few days and truck parked outside. I changed fuel filters and will also start using Howes anti gel cetane boost from now on.

Plugging in your truck does help make starting easier by keeping the block warmer. I use 5w40 oil and that helps too. I believe it is recommended to plug in when temps are 20 f or lower. I do it all winter and set a timer to come on 3 hrs before I leave for work. This is all thats needed. The heater is high draw on power and you electric bill will reflect leaving it on all night.

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